Mortar mixer



iff/2 July 27 192e'. 1,593,706 F. o. sKooG MORTAR MIXER Filed March 4, 192e 2 sheets-sheet 1 July 27 1926.

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'1,593,706 F. o. sKooG MORTAR MIXER Filed March 4T 192e 2 sheets-sheet 2 12 IIJ? .22 M v .16' jg 9 2l zo J9 Patented July 2'7, 1926.

UNITED STATES FRANK O. SKOOG, OF CHICAGO, ILLELLTOIS.

MGRTAR MIXER.

Application filed March 4, 1826. Serial No. 92,171.

My invention relates generally to mortar mixe-rs and in particular to a portable machine of this kind which may be widely used for mixing mortar.

It is an object of my invention to provide a machine for mixing mortar which is simple in construction, easy to operate and which can be economically manufactured.

A further object is to provide a mortar mixer which is economical in power consumption, which saves labor in the mixing operation and is capable of producing a mixed batch of the proper proportions in avery short time.

Other objects will appear from the following description, reference being had to the accompanying drawings in which:

Fig. 1 is a perspective view of the mortar mixer of my invention as used.

Fig. 2 is a quarter section of the collar and yoke which is used to aid in supportingl the mixing bit.

Fig. 3 is a side elevation of the major portion of the mixing machine of my inr vention.

Fig. 4 shows a modified form of mixing bit.

Fig. 5 is an elevation of a second modiication of the mixing bit.

Fig. 6 is a bottom plan view of the bit shown in Fig. 5.

Fig. 7 is a bottom shown in Fig. 3.

It is now rather common practice in construction work, to have machine mortar mixers. The machines in present use however, under certain conditions, have serious disadvantages which are overcome by my invention. In most of these power operated mortar mixers it is necessary to shovel the slaked lime and sand into an elevated hopper, which is in itself a laborious operation. It is diflicult in operating such a machine to accurately gauge the proportions of lime and cement which are used to'make mortar. Since the machines as generally used are continuously operating, in order to properly gauge the ingredients of the plaster, it is necessary that practically each shovelful put into the machine be properly propor. tioned. The slakedlime, sand, and cement are shoveled into the trough of the machine while the water is poured in. It is almost impossible to get the correct proportions in the rst instance, because the slaked lime plan view of the bit is very adhesive and sticks to the shovel, making the shovelsful of unequal size. The sand used may contain various quantities of moisture, thus changing the consistency of the batch. ln addition, this shoveling operation, in the filling of a machine, permits the slalied lime to cool off. In winter this is a very serious disadvantage vsince it is very desirable to use the mortar while it is warm. 'llhen using a. machine of the above mentioned type it is necessary to slake the lime in receptacle or box of some kind or other and, after the lime has been slaked, to shovel it into the trough of the machine. By the use of my invention this operation of transferring the slalred lime to the machine is entirely eliminated.

In addition, in construction operations which are not of sufficient size to warrant the use of the ordinary mixing machine, my device may be eiliciently employed, since it is relatively cheap and can be easily moved from job `to vjob. On these small jobs` the machine of my invention has enormous advantages over the old method of mixing by means of a hoe.

It will be apparent that while the machine of my invention is particularly designed for mixing mortar it may be used with equal advantage for mixing plaster finishing cement, and similar materials.

Referring to Fig. l, the mortar mixing box 7 is shown as partly filled with the slaked lime, sand, and water. A pair of upright members 8 are removably secured near the ends of one side of the box by means of clamps 9, which are bolted to the uprights and fit over the side edge of the mixing box. These uprights may be inclined away from l this edge of the box, so that mfxing bit may be ,moved close to the edge of the box. A cross piece l0 is adjustably fixed near the upper ends of the uprights 8 by a suitable clamping means such as the clamps 1l which consist of a pair of plates secured by bolts. This cross piece serves as a support for a pipe handle l2 which is secured to a motor 13, as will be hereinafter described in detail. A handle 14 is secured at the other side of the motor and serves as a means by which the mixing bit l5 which is rotated by the motor may be shifted to various positions in the mixing box.

Referring more particularly to the de tailed construction as shown in Fig. 3, the

S) ll handle 12 has a heavy pipe kcollar 16 pinned at its end. This pipe fits over the end of a pine handle 17 which, as is usual in motors constructed for use in driving a drill, is screwed into the motor housing. A bolt 18 removably fastens the pipe collar 16 to this pipe 17. Similarly the handle pipe or rod 19 is pinned to a coupling pipe 2O which in turn is removably secured by a bolt, or some other suitable means, to a handle pipe 21 which yis screwed into the motor housing.

This construction permits the 'pipe 12 and the handle 14C to be removed when the machine is to be moved from .one job to another.

Bands of iron 22 are bent to fit around the housingV of the motor and are suitably bolted together and to the pipe handles 17 and 21. They are preferably drawn together by these bolts so as to securely clamp the motor housing and to reinforce the pipe handles 17 and 21. The motor 18, Which may be either electrically or lpneumatically operated, is preferably of the type as used with large sized drills. As shown in the drawings, it is an electric motor which has a suitable speed reduction gearing Within the housing 23, and is provided with a suitable chuck 2li on the reduced speed shaft. The shaft 25 of the mixing bit 15 is secured in this chuck in the usual manner.

As shown in Figs. 2 and 3, a collar 26 is removably secured to the bit shaft 25 by means of a bolt 27 which passes through a ring 28 which lits around the lower portion of the collar 26. A yoke 29 is rotatable upon the collar 26, being held in position by its upper flange 26EL and the upper surface of the ring k28. The yoke 29 has a plurality of ears 30 which are adapted to receive bolts so as to permit the attachment of the braces 31, 32, 33 and 34 Which at their other ends are secured to the bands 22. While these braces and the collar and yoke support are vnot necessary to hold the bit in the chuck, yet is is sometimes desirable to provide this additional safety device to hold the mixing bit in the chuck. The mixing bit preferably comprises a spiral or helical blade 35 which may be Welded or riveted to the shaft 25. This blade terminates a short distance from the lower end of the bit so that the machine may be used `with the end of the shaft 25 as a support Without damaging the blade. The lower end of this blade is out away in the shape of a spiral as shown at 35?' in Fig. 7, so as to eliminate the possibility of its rotation bemg arrested upon its coming into contact With small obstructions.

In Fig. t, I have shown a modified form of mixing bit vwhich is adapted to mix -mortar after it has set for seme time when the resistance to motion of the bit is greater. In this modification a plurality of blades 36 are riveted or otherwise suitably secured to a supporting bit or shaft 37. These blades are preferably arranged at 90 degree intervals in a spiral about the shaft 37. These blades offer less resistance to the motion of the bit so that when the mortar is very stiff a bit of this type will readily break up and mix the mortar.

In Figs. 5 and G I have illustrated a second modied form of mixing bit. In most respects it is similar to the bit shown in Fig. 3, the only difference being that the bit shown in Fig. 5 has a small depending scraper flap 38 which is hinged to the lower `radial edge of the spiral blade 39, which in turn is riveted or Welded to the bit shaft 40. Suitable leaf springs 41, or other resilient means, may be riveted to the depending scraper flap 38 so that the flap Will resiliently scrape the mortar Which may have tendency to adhere to the bottom of the mixingl trough. Since the box in Which my mixing machine is used may frequently have a rough bottom, although I contemplate its use With a box having a plate steel bottom, it is desirable to have the resilient means to permit the flap to swing back when an obstruction is met. The springs l1 are of sufficient strength to hold the flap in a position as shown in Fig. 5 or forward of this position during the mixing operation as long as no obstructions are met.

In the operation of my mixer the electric motor is controller by a switch 12, which may be conveniently secured to the handle lei adjacent one of the grips i3 which are fixed at the end of the handle. The extension cord fet Which leads from this srv ch may be conveniently Wound around spring clips riveted to the handle la as slack is taken up, and unvvound as `Greater length of cord is needed. The switcn el2 is connected to a plug 16 Which fits into a suitable socket 47 secured to the housing of the motor 13.

In the use of this mixing machine, after the lime has slaked and the sand been added in proper proportions the mortar mixer is used in the position as shown in Fig. 1. The operator of the machine, of course, clasps the handles 13 and shift-s the position of the mixing bit 15 by sidewise motion, using the point of contact of the pipe extension 12 With the cross bar 10 as a pivot, or he may slide the machine back and forth in the mortar, using the support 10 as a guide for the pipe 12. To shift the machine sidevvise the operator presses down on the handle 14 and rotates the Whole machine, using the end of the bit shaft 25 as a pivot so as to move the pipe 12 to a new position on the cross piece l0. It Will therefore be apparent that even With relatively unskilled labor, the machine may be operated so that the mixing will be complete throughout the box. I have found it desirable to rotate the bit 15 so that the IOC lli

sand and mortar are propelled upwardly thereby in the mixing operation, although I realize that in certain instances it may be desirable to so form the spiral on the mixing bit or to rotate the bit in a direction so that the mortar will be forced downwardly by the mixing bit.

While I have shown and described my invention in detail I do not wish to limit myself to any particular embodiment of my invention since it is apparent that various other forms may be readily devised to operate on similar principles. I therefore do not wish to be limited except as by the claims which follow.

I claim:

1. In combination, a receptacle adapted to contain materials to be mixed, a horizontal support positioned adjacent said rece, tacle, a mixing tool, a motor to drive said tool, a rod secured to said motor and adapted to rest upon said support in various positions, and a handle lixed to said motor opposite said rod for manually shifting said rod universally upon said support.

2. In a device of the class described, the combination of a mortar box having a substantially vertical H-shaped support clamped to a side thereof, the horizontal member of said support being vertically adjustable on the vertical members of said support, a motor, a mixing bit arranged to be rotated thereby, supporting means secured to said motor and resting on said support, and a handle fastened to said motor whereby the motor and bit may be manually shifted over any desired portion of said box.

3. In a mixer, a mixing tool, a motor for rotating said tool, a clamp about the housing of said motor, a support, a pair of oppositely extending handles secured to said clamp for manually shifting said tool and motor, one of said handles being adapted to rest upon said support and to have universal movement thereon, and a journal for said tool, said journal being fixed to saidA clamp to prevent lateral and axial movements of said tool relative to said clamp.

4. In a mortar-mixer, a mortar container, a guide member mounted thereon, a mixing blade adapted to be manually moved in any desired direction relative to said receptacle, a motor for driving said blade, and means whereby said motor and blade may be manually moved relative to said container, said means comprising a handle and a rod secured to said motor, said rod resting on said guide member. y

5. A mortar mixer comprising a mortar container, a guide member mounted thereon, a mixing blade adapted to agitate the mortar in said container, and means for supporting the motor and blade, said means comprising a rod adapted to rest on -said guide member and a handle portion whereby said motor and blade may be raised and shifted in any desired direction relative to said container.

6. A mixer comprising a motor-driven stirring tool, supports projecting in opposite directions from said motor-driven stirring tool, and a carrier on and along which one of said supports has universal movement, the other support being adapted to be held and supported by the operator.

In witness whereof, I hereunto subscribe my name this 2nd day of March, 1926.

FRANK O. SKOOG. 

